I can see where a full funeral would be extremely difficult. Since you are donating his body to science you may look into a possible gathering at the hospital chapel while you are still in the hospital. Here where I work I have seen that done many times with the hospital chaplain or the family's private priest/preacher/etc... saying a few sweet words with a lullabye and letting all know Nathaniel is going to help other babies through the research he will provide. That way you can have it taken care of while you are still hosptialized and family is present.
Dee Dee, Mom to 2 handsome young men & 2 beautiful girls!